Gas tube for semi-automatic firearm



FIG. 1 is a bottom view of a gas tube for semi-automatic firearm,showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a rear end view thereof; and,

FIG. 5 is a front end view thereof.

The ornamental design for a gas tube for semi-automatic firearm, asshown and described.